Following their relegation from the Premier League after just one season, the Seasiders came painfully close to an immediate return to the top flight.
Carlton Cole edged the Hammers in front at Wembley, before Tom Ince levelled the scores at the beginning of the second half.
The winner came in the final moments of the contest, with Ricardo Vaz Tê proving to be the hero for the East London outfit.
This marked the beginning of a slump for Blackpool, as members of the 2010 promotion-winning team went their separate ways, while issues with the then-Oyston ownership increased.
Here’s a look at where the Seasiders squad that lost to West Ham are now:
7. Matt Phillips
Matt Phillips was with Blackpool between 2010 and 2013, and has since represented the likes of QPR, West Brom and Oxford United. Back in February, the 35-year-old joined Stevenage on a deal until the end of the season. Photo: Richard Heathcote
8. Barry Ferguson
Barry Ferguson took on his first coaching role with Blackpool, taking over as caretaker in 2014, having joined the club as a player in 2011. His most recent stint in the dugout came last year with Rangers, with the 48-year-old taking interim charge at Ibrox. Photo: Mark Thompson
9. Angel Martinez
Angel Martinez was with the Seasiders from 2011 to 2014. Since retiring in 2021, the midfielder has taken on media work in Spain, as well as being a representative on his local council in Girona. Photo: Stu Forster
10. Stephen Dobbie
Stephen Dobbie enjoyed four loan stints with the Seasiders, scoring 15 goals and providing eight assists in 56 appearances. The retired striker has worked as a coach at the club for a number of years, initially with the youth team, and in more recent times under both Steve Bruce and Ian Evatt with the first-team. Photo: Gareth Evans
11. Kevin Phillips
Kevin Phillips represented Blackpool between 2011 and 2014. Since retiring in 2014, the 52-year-old has gone down the coaching route, with his last club being AFC Fylde - whom he parted ways with last year. Photo: Richard Heathcote
12. Tom Ince
Tom Ince scored 33 goals and provided 28 assists in 113 appearances for the Seasiders between 2011 and 2014, and was still playing in the Championship last season with Watford. Photo: IAN KINGTON